1. Pull your hair back off your face by wetting it or tying it back.
2. Draw an outline of your face with lipstick on a mirror or on transparent paper or on a photo.
3. Now compare your outline to the below:

Oval - Length equals around one and a half times width.
As oval is considered to be the ideal face shape it is therefore the most versatile, so nearly every hair style will look good on this face.

Round - Round hairline and chin line, wide face and round cheeks
If you have a round face shape, the goal here is to slim the face. Hair below the chin line should be worn with a face-lengthening center parting.